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ARM: shmobile: r8a7740: Add CPU sleep suspend

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Add the lighest possible sleep mode on Cortex-A9 cores: CPU sleep.
It is entered by a simple dsb and wfi instruction via cpu_do_idle(). As
just clocks are stopped there is no need to save or restore any state of
the system.

Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com>
Acked-by: Magnus Damm <damm@opensource.se>
[ horms@verge.net.au: Added missing includes ]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Bastian Hecht 2012-12-05 12:13:07 +00:00 committed by Simon Horman
parent 13baf88bd6
commit 895d3b53fd
3 changed files with 25 additions and 0 deletions
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2
arch/arm/mach-shmobile/board-armadillo800eva.c
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@ -1181,6 +1181,8 @@ static void __init eva_init(void)
rmobile_add_device_to_domain("A4LC", &hdmi_lcdc_device);
if (usb)
rmobile_add_device_to_domain("A3SP", usb);
r8a7740_pm_init();
}
static void __init eva_earlytimer_init(void)

1
arch/arm/mach-shmobile/include/mach/common.h
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@ -52,6 +52,7 @@ extern void r8a7740_add_early_devices(void);
extern void r8a7740_add_standard_devices(void);
extern void r8a7740_clock_init(u8 md_ck);
extern void r8a7740_pinmux_init(void);
extern void r8a7740_pm_init(void);
extern void r8a7779_init_irq(void);
extern void r8a7779_map_io(void);

22
arch/arm/mach-shmobile/pm-r8a7740.c
View File

@ -9,7 +9,9 @@
* for more details.
*/
#include <linux/console.h>
#include <linux/suspend.h>
#include <mach/pm-rmobile.h>
#include <mach/common.h>
#ifdef CONFIG_PM
static int r8a7740_pd_a4s_suspend(void)
@ -58,3 +60,23 @@ void __init r8a7740_init_pm_domains(void)
}
#endif /* CONFIG_PM */
#ifdef CONFIG_SUSPEND
static int r8a7740_enter_suspend(suspend_state_t suspend_state)
{
cpu_do_idle();
return 0;
}
static void r8a7740_suspend_init(void)
{
shmobile_suspend_ops.enter = r8a7740_enter_suspend;
}
#else
static void r8a7740_suspend_init(void) {}
#endif
void __init r8a7740_pm_init(void)
{
r8a7740_suspend_init();
}